Differences in Small-Signal Stability Boundaries Between Aggregated and Granular DFIG Models
Abstract
Broadband oscillations in wind farms have been widely reported in recent years. Past studies have examined various types of oscillations in wind farms, relating small-signal stability to control settings, operating conditions, and electrical parameters. However, most analyses are performed on aggregated single-unit models, which may deviate from the true behavior, leading to misleading stability assessments. To investigate how aggregation affects stability conclusions, this paper develops detailed single-, two-, and three-unit doubly-fed induction generator (DFIG) models and their aggregated counterparts. Then, a D-decomposition-related ray-extrapolation method is proposed to characterize the small-signal stability region of nonlinear DFIG models in the parameter space, delineating stability boundaries under numerous parameter combinations. The study reveals that aggregated models stability regions within the parameter planes of control settings and operating conditions differ from those of granular models in terms of basic shape, critical modes, and evolution patterns, posing a risk of misjudging stability margins.
Cite
@article{arxiv.2604.07777,
title = {Differences in Small-Signal Stability Boundaries Between Aggregated and Granular DFIG Models},
author = {Leyou Zhou and Mucheng Li and Xiaojie Shi and Meng Zhan and Juanjuan Wang and Dan Wu},
journal= {arXiv preprint arXiv:2604.07777},
year = {2026}
}
Comments
6 pages, 6 figures. Submitted to IEEE PowerCon 2026